Does the screenshot relate to him quoting Tropic Thunder? If not then he had no real reason to say it.
He’s calling the other guy a retard. There’s no reason at all to say it.
Then I have no sympathy for the man.
Especially when it’s this easy to expand your vocabulary.
Oh noes! I sense a “thinly veiled” attack upon my personage. Help me Obi-Wan Kenobi, you’re my only hope…
If I were personally attacking you you’d know it. There’s not many things more overt than me verbally assaulting someone.